Add Ghost.Nvtt C# wrapper and integrate nvtt texture pipeline

- Introduce full managed C# wrapper for NVIDIA Texture Tools (nvtt) with safe handle classes, idiomatic APIs, and managed callback support.
- Integrate Ghost.Nvtt into Ghost.Editor.Core and Ghost.MicroTest; update TextureAssetHandler to use the new nvtt wrapper for texture compression.
- Add comprehensive end-to-end binding test (NvttBindingTest).
- Refactor D3D12 resource management: add deferred/immediate release APIs, update allocator/database usage, and ensure proper resource cleanup.
- Update project files for new native DLL layout and dependency versions.
- Minor API cleanups: EditorApplication properties, D3D12 input layout, and removal of obsolete code.
- Update shaders, tests, and documentation for new APIs and usage patterns.

src/Runtime/Ghost.Engine/EngineCore.cs

@@ -1,11 +1,13 @@
 using Ghost.Entities;
+using Ghost.Graphics;
 using Misaki.HighPerformance.Jobs;
 
 namespace Ghost.Engine;
 
 public interface IEngineContext : IDisposable
 {
-    JobScheduler JobScheduler { get; }
+    IJobScheduler JobScheduler { get; }
+    IRenderSystem RenderSystem { get; }
 }
 
 [AttributeUsage(AttributeTargets.Class, AllowMultiple = false, Inherited = false)]
@@ -17,13 +19,24 @@ internal class EngineEntryAttribute : Attribute
 internal sealed partial class EngineCore : IEngineContext
 {
     private readonly JobScheduler _jobScheduler;
+    private readonly RenderSystem _renderSystem;
 
-    public JobScheduler JobScheduler => _jobScheduler;
+    public IJobScheduler JobScheduler => _jobScheduler;
+    public IRenderSystem RenderSystem => _renderSystem;
 
     public EngineCore()
     {
         _jobScheduler = new JobScheduler(Environment.ProcessorCount - 2); // We -2 here, one for main thread, one for render thread
 
+        // TODO: Remove the windows dependency from RenderSystem.
+        var renderingConfig = new RenderingConfig
+        {
+            FrameBufferCount = 2,
+            GraphicsAPI = GraphicsAPI.Direct3D12,
+        };
+
+        _renderSystem = new RenderSystem(renderingConfig);
+
         ComponentRegistry.GetOrRegisterComponentID<ManagedEntityRef>();
     }